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-rw-r--r--build-aux/distcheck.scm14
1 files changed, 9 insertions, 5 deletions
diff --git a/build-aux/distcheck.scm b/build-aux/distcheck.scm
index 4b08c66..83e3db3 100644
--- a/build-aux/distcheck.scm
+++ b/build-aux/distcheck.scm
@@ -39,13 +39,17 @@ arguments."
          (cut proc port)
          (cut close-pipe port))))))
 
+(define (call-with-archive-file archive file proc)
+  "Call PROC with port reading FILE in lzip compressed tar ARCHIVE."
+  (call-with-input-pipe (list "tar" "--extract" "--to-stdout"
+                              "--file" archive
+                              (string-append (basename archive ".tar.lz")
+                                             "/" file))
+    proc))
+
 (define (package-in-archive dist-archive)
   "Return the package object in guix.scm of DIST-ARCHIVE."
-  (call-with-input-pipe (list "tar" "--extract" "--to-stdout"
-                              "--file" dist-archive
-                              (string-append
-                               (basename dist-archive ".tar.lz")
-                               "/guix.scm"))
+  (call-with-archive-file dist-archive "guix.scm"
     (lambda (port)
       (eval-string (get-string-all port)
                    #:file (string-append (getcwd) "/guix.scm")))))